<template>
  <div class="app-container">
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;" />

    <el-tree
      ref="tree2"
      :data="state.data2"
      :props="state.defaultProps"
      :filter-node-method="filterNode"
      class="filter-tree"
      default-expand-all
    />

  </div>
</template>

<script setup>
import { ref, reactive, watch } from 'vue'

const tree2 = ref()
const filterText = ref('')
const state = reactive({
  data2: [{
    id: 1,
    label: 'Level one 1',
    children: [{
      id: 4,
      label: 'Level two 1-1',
      children: [{
        id: 9,
        label: 'Level three 1-1-1'
      }, {
        id: 10,
        label: 'Level three 1-1-2'
      }]
    }]
  }, {
    id: 2,
    label: 'Level one 2',
    children: [{
      id: 5,
      label: 'Level two 2-1'
    }, {
      id: 6,
      label: 'Level two 2-2'
    }]
  }, {
    id: 3,
    label: 'Level one 3',
    children: [{
      id: 7,
      label: 'Level two 3-1'
    }, {
      id: 8,
      label: 'Level two 3-2'
    }]
  }],
  defaultProps: {
    children: 'children',
    label: 'label'
  }
})

const filterNode = (value, data) => {
  if (!value) return true
  return data.label.indexOf(value) !== -1
}

watch(filterText, val => {
  tree2.value.filter(val)
})
</script>

